On YouTube, you can find practically an entire syllabus of Dothraki 101, including pronunciation guides, practice videos and chat groups. There's even an unofficial Dothraki-English dictionary.

Entire scenes in the show are done with subtitles in a language that was created by an amateur linguist who answered an online casting call.

"The Language Creation Society put out a call to the various language creation communities online and I was one of those who responded," said David Peterson, 32, who went on to create the Dothraki language, which at this point is every bit as real as Klingon from "Star Trek" or Navi from "Avatar."

Peterson's Dothraki was inspired by the language of George R.R. Martin's books, but it's an entirely new creation.

"I kind of interpreted how I thought George R.R. Martin wanted these things pronounced, and then did something to reflect that," Peterson said. "But I apparently got it wrong. He actually pronounces it Doth-ROCK-EYE. It was really befuddling to me when I saw this the first time."

Peterson's language has a bit more of an Arabic feel to it. For English speakers, it doesn't exactly trip off the tongue. Peterson records every line for the actors and says individual actors have surprised him by adding accents and styles of speaking that he says suit the backstories of their characters.

Why bother with this level of detail?

"I think the bar is just being raised," he said. "Audiences are coming to expect this type of thing. They expect this level of authenticity."

Dothraki has been so successful that Peterson has been hired to create alien languages for several sci fi shows in development on other cable networks, plus a second "Game of Thrones" language that will debut Sunday in the third season's premiere.